<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <ul>
            <li v-for="item in arr">{{item}}</li>
        </ul>
        <button @click="fn">走一走</button>
    </div>
</body>

<script src="../vue.js"></script>
<script>
    const app = new Vue({
        el: "#app",
        data: {
            arr: ['帅哥', '美女', '程序员']
        },
        methods: {
            fn() {
                this.arr.push(this.arr.shift())
                // this.arr.shift(this.arr[0])

            }
        }
    })
</script>

</html>